Features
VLAN Tagging
Strata CIX General Description
109
VLAN Tagging
System Availability: All systems
The MIPU / LIPU / LIPS and IP5000-series/IPT2000-series phones support 802.1Q Virtual Local
Area Network (VLAN) technologies. For sites with LANs that have 1000’s of IP devices, VLANs
can be used to separate the network virtually rather than physically, to prevent the broadcast and
other traffic from one virtual LAN (typically a data lan) from impairing the performance of
equipment on another virtual LAN (for example a VoIP LAN) even though the devices are
plugged into the same physical network. VLAN for the IPT phone and the phone’s data port can
each be programmed manually in the phone, or remotely through eManager. And within or
without VLANs, 802.1P and Diffserv can be used to provide Quality of Service for voice by
allowing voice packets to be prioritized over data packets. Note that when using 802.1Q or 802.1P
it is important to ensure that all the network of the ethernet switches and routers are capable of
supporting this.
Reasons why a company might want VLANs:
• Security – Separating systems that have sensitive data from the rest of the network decreases
the chances that people will gain access to information they are not authorized to see.
• Projects/Special Applications – Managing a project or working with a specialized application
can be simplified by using a VLAN that brings all the required nodes together.
• Performance/Bandwidth – Careful monitoring of network use enables the network
administrator to create VLANs that reduce the number of router hops and increase the apparent
bandwidth for network users.
• Access Lists – Provides the network administrator with a way to control who sees the different
types of network traffic. An access list is a table the network administrator creates that lists
which addresses have access to that network.
• Broadcasts/Traffic flow – Since a principle element of a VLAN is the fact that it does not pass
broadcast traffic to nodes that are not part of the VLAN, it automatically reduces broadcast
traffic.
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